package com.hmdp.utils;

import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {


    private  static final long BEGIN_TIMESTAMP = 1640995200L;
    private  static final int COUNT_TTS = 32;
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    public long nextId(String keyPrefix){
        //1 生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long time = nowSecond - BEGIN_TIMESTAMP;

        //2 生成序列号
        String date = now.format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":day" + date);
        //3 拼接并返回
        return time<<COUNT_TTS|count;
    }

    public static void main(String[] args) {
        LocalDateTime localDateTime = LocalDateTime.of(2022, 1, 1, 0, 0, 0);
        long epochSecond = localDateTime.toEpochSecond(ZoneOffset.UTC);
        System.out.println("second="+epochSecond);

    }

}
